8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=8b2e9003, *pmd=fed2b003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 17036 Comm: syz.0.3648 Not tainted 6.10.0-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at path_from_stashed+0x1c/0x308 fs/libfs.c:2204
LR is at open_namespace+0x44/0xbc fs/nsfs.c:102
pc : [<8053b05c>]    lr : [<8054d800>]    psr: 80000013
sp : dfda5e80  ip : 84123c00  fp : dfda5ec4
r10: 84123c00  r9 : 00000003  r8 : 8b376480
r7 : 82caa250  r6 : 84123c00  r5 : 00000000  r4 : 85086be0
r3 : dfda5ecc  r2 : 00000008  r1 : 82c95800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 847ccb40  DAC: 00000000
Register r0 information: non-paged memory
Register r1 information: slab kmalloc-1k start 82c95800 pointer offset 0 size 1024
Register r2 information: non-paged memory
Register r3 information: 2-page vmalloc region starting at 0xdfda4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r4 information: slab anon_vma_chain start 85086be0 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 84123c00 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82caa240 pointer offset 16 size 184
Register r8 information: slab filp start 8b376480 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 84123c00 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfda4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r12 information: slab task_struct start 84123c00 pointer offset 0 size 3072
Process syz.0.3648 (pid: 17036, stack limit = 0xdfda4000)
Stack: (0xdfda5e80 to 0xdfda6000)
5e80: 84121800 00000008 dfda5eb4 dfda5e98 806e6a64 804065ac 00000009 85086be0
5ea0: 00000000 84123c00 84122080 8b376480 00000003 84123c00 dfda5ef4 dfda5ec8
5ec0: 8054d800 8053b04c dfda5ef4 00000000 00000000 7218aaa8 85086be0 85086be0
5ee0: 84121800 00000008 dfda5f14 dfda5ef8 80552824 8054d7c8 0000ff07 00000000
5f00: 8b376481 00000000 dfda5fa4 dfda5f18 8051a8f8 805526ac 84123c00 00000001
5f20: ecac8b10 84123c00 dfda5f44 dfda5f38 8190639c 8190626c dfda5f5c dfda5f48
5f40: 8024b544 8027aebc 40000000 dfda5fb0 dfda5f84 dfda5f60 80202dd8 8024b500
5f60: 8261c90c dfda5fb0 0014ab60 ecac8b10 80202cc0 7218aaa8 dfda5fac 00000000
5f80: 00000000 002662dc 00000036 8020029c 84123c00 00000036 00000000 dfda5fa8
5fa0: 80200060 8051a7d0 00000000 00000000 00000003 0000ff07 00000000 00000000
5fc0: 00000000 00000000 002662dc 00000036 7ee60766 7ee60767 003d0f00 76b740bc
5fe0: 76b73ec8 76b73eb8 00018444 001306b0 60000010 00000003 00000000 00000000
Call trace: 
[<8053b040>] (path_from_stashed) from [<8054d800>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:84123c00 r9:00000003 r8:8b376480 r7:84122080 r6:84123c00 r5:00000000
 r4:85086be0
[<8054d7bc>] (open_namespace) from [<80552824>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:84121800 r4:85086be0
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
 r7:00000000 r6:8b376481 r5:00000000 r4:0000ff07
[<8051a7c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfda5fa8 to 0xdfda5ff0)
5fa0:                   00000000 00000000 00000003 0000ff07 00000000 00000000
5fc0: 00000000 00000000 002662dc 00000036 7ee60766 7ee60767 003d0f00 76b740bc
5fe0: 76b73ec8 76b73eb8 00018444 001306b0
 r10:00000036 r9:84123c00 r8:8020029c r7:00000036 r6:002662dc r5:00000000
 r4:00000000
Code: e24dd01c e1a07001 e5911004 ee1dcf70 (e5905000) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e24dd01c 	sub	sp, sp, #28
   4:	e1a07001 	mov	r7, r1
   8:	e5911004 	ldr	r1, [r1, #4]
   c:	ee1dcf70 	mrc	15, 0, ip, cr13, cr0, {3}
* 10:	e5905000 	ldr	r5, [r0] <-- trapping instruction